/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kaaproject.kaa.client.channel.impl.channels.polling;


public abstract class CancelableCommandRunnable implements CancelableRunnable {

  protected volatile Command currentCommand;
  private volatile boolean isRunning = false;

  @Override
  public void run() {
    isRunning = true;
    try {
      if (!Thread.currentThread().isInterrupted()) {
        executeCommand();
      }
    } finally {
      isRunning = false;
      synchronized (this) {
        this.notifyAll();
      }
    }
  }

  /**
   * Waits until a command executed.
   */
  public void waitUntilExecuted() {
    while (isRunning) {
      synchronized (this) {
        try {
          this.wait();
        } catch (InterruptedException ex) { //NOSONAR
        }
      }
    }
  }

  @Override
  public void cancel() {
    if (currentCommand != null) {
      currentCommand.cancel();
    }
  }

  protected abstract void executeCommand();

}
